The 600-700W range is very popular with enthusiasts who either have a pair of fairly powerful GPUs or a single top of the line GPU, as they don't quite need a kilowatt class PSU. X-bit Labs put together a roundup which features 9 PSUs from Corsair, Chieftek, Cooler Master and Zalman some modular and some with permanently connected wiring. It was the Corsair TX650 which received the Recommended Buy award though Cooler Master came close to winning as well. Some of the other models fared poorly thanks to the lack of proper voltage regulation or in one case fan regulation. Check out the full review here.

"We would like to talk about nine power supply units from the most popular 600-700 W wattage range, which represent six different series of devices from four manufacturers: Chieftec, Cooler Master, Corsair and Zalman."

Seasonic's new X-1250 PSU can provide 1250W of power, just as the name suggests, with up to 104 amps to the 12V rail which should provide enough power for even the most power hungry GPUs. Instead of going with a single rail design Seasonic chose to provide 4 rails so you should ensure to know which plugs you are using. It passed all of [H]ard|OCP's torture tests with flying colours, making it one of the better kilowatt ckas PSUs they have had the pleasure of testing and when you consider the price, with or without the rebate, it is a perfect choice for users building a system with multiple GPUs.

"Seasonic makes some of the best enthusiast computer power supplies in the world. It has long produced some of the cleanest power producing PSUs along with being some of the quietest on the market. The new fully modular X-1250 sports many enthusiast features and touts gold level efficiency. Is this new X-1250 worthy?"

It has not been too long since Lee Garbutt reviewed Corsair’s AX1200i Power Supply. Corsair used that product to introduce their Corsair Link Dashboard to the monitoring of Power Supply performance. Lee was very impressed with the supply and gave it a Gold Award.

Some of us are not looking to power a microwave inside our PCs. Corsair has thusly brought that feature to lower wattage PSUs with their new AX860i and AX760i. These PSUs achieve 80 PLUS Platinum certification along with the Digital Signal Processor connection to monitor. If you would rather have $30 USD instead of monitoring capabilities: each model number without the i contains the same 80 PLUS Platinum certification just without the monitoring capabilities. As an added bonus the Corsair power supplies should be very silent. The 860W power supply will shut down its fan to 0 RPM until it reaches a 60% load while the 760W will operate without fans until a 70% load.

These PSUs will be available in November and are priced: $249.99 USD for the AX860i vs. $219.99 USD for the AX860. The AX760i will be available for $229.99 USD vs. $199.99 for the AX760. Again, the i denotes the ability to be monitored by Corsair’s Link Dashboard software.

Corsair's new AX1200i PSU is 80 Plus Platinum rated and sports Link monitoring and control software as you might remember from Lee's review. On the off chance that you would like a second opinion about the PSU, [H]ard|OCP recently published their own review. Just like Lee they were impressed with the voltage regulation, efficiency, and DC Output quality though they were less impressed with the noise they saw during their Transient Load Test. They also questioned the use of the Link tweaking software and while the final verdict was positive in some ways they didn't feel this PSU was as true successor to the stellar AX1200 released almost two years ago.

"Corsair has a refresh today that talks to its high end line of high power PSUs. The AX1200i comes in touting "platinum" efficiency and "an unprecedented level of monitoring and performance customization." How does the AX1200i perform out-of-the-box and does it actually bring value at its huge price?"

"Enermax is a long standing quality desktop PSU company. It not only specifies and designs power supplies it is one of the few companies that actually build enthusiast PSUs. Enermax today moves it 1350 watt giant into "Platinum" efficiency territory with the new Platimax 1350W."

Introduction and Features

Corsair continues to bring a full line of high quality power supplies, memory components, cases, cooling components, SSDs and accessories to market for the PC enthusiast and professional alike. Corsair's updated Professional Series HX power supplies include four models; the HX650, HX750, HX850 and HX1050. All of the power supplies in the Professional Series feature modular cables, premium quality components, an energy-efficient design (now 80 Plus Gold certified) and quiet operation; and they are backed by a 7-year warranty and lifetime access to Corsair's comprehensive technical support and customer service. The most obvious differences between the new models and the old Professional Series HX PSUs are the new 80 Plus Gold efficiency certification (upgraded from 80 Plus Silver) and the ability to operate in fanless-mode.

Here is what Corsair has to say about their new Professional Series HX PSUs:

"Legendary Performance and Reliability

Corsair Professional Series HX power supplies are designed for PC builders and upgraders who need a highly efficient, quiet, and supremely-reliable power supply, with a modular cable-set that makes installation a breeze.

Quiet Operation at Low Loads

Thanks to their highly-efficient design, Corsair Professional Series power supplies generate minimal heat, and are able to operate in a silent, fully-fanless mode at up to 20% of the PSU’s maximum load (170W for the HX850). This means that Professional Series HX PSUs will be completely silent when you’re performing less intensive tasks, such as web browsing or chatting in forums. And the thermally-controlled fan spins up gradually above 20% load, so that it still operates quietly during normal use and when gaming. Basic PC power supplies have fans that spin all the time your PC is on – whether you’re pushing your graphics card to the limit or just surfing the web – making them noisier and more intrusive.

Modular Cables for Easy Installation

Professional Series power supplies have a comprehensive modular cable set that allows you to use only the cables you need for your particular set of components. The benefits of this include a cleaner, neater installation, and that ‘professionally-built’ look, plus increased airflow through the case due to reduced cable clutter. The cables are also long enough to support full-tower cases.

80 PLUS Gold: High Efficiency – Low Heat

Efficiency is the measurement of how effectively a power supply converts AC power from your wall outlet to the DC power used by your PC’s components. If your power supply isn’t efficient, it will generate more heat, which requires more cooling and more fan noise. And, it might even affect your power bill.

Professional Series HX PSUs are among the most efficient on the market. Each model has 80 Plus Gold certification, which ensures up to 90% energy-efficiency. This helps to keep your PC cool and quiet, and it may even save you money too.

Reliable

Professional Series HX PSUs are built with premium components, such as 105°C capacitors, and are capable of continuous power delivery at a temperature rating of 50°C, ensuring maximum performance and reliability even in the most demanding and hot-running performance PCs.

The Corsair Advantage

Corsair Professional Series PSUs are backed by a reassuring 7-year warranty and comprehensive customer support via telephone, email, forum and the Tech Support Express helpdesk."

EVGA's SuperNOVA NEX1500 Classified 1500W PSU is more than just a source of power that would satisfy even a certain stand up comedian turned TV star, it also features some rather interesting extras. Some of the features bear a resemblance to those found on the Corsair AX1200i Digital ATX 1200W which Lee reviewed a short while ago, like programmable rails and software which allows monitoring and control of certain aspects of the PSU. While the 10 year warranty is a good sign, TechPowerUp! found a few questionable results from the tests they ran.

"EVGA's new SuperNOVA NEX1500 power supply packs a great deal of features with the most fascinating being its enormous capacity, reaching 1500 W and up to 1650 W, when overclock mode is enabled. Combined with software monitoring and control, the fully modular design and the sleeved cables this is a PSU enthusiast's dream come true."

EVGA, a company most well-known for its line of graphics cards and enthusiast motherboards, has rounded out its computer offerings by announcing a power supply product. The NEX1500 Classified power supply (PSU) is a first for the company, and is released under the company’s high-end “Classified” series.

The NEX1500 Classified is a fully modular power supply that is able to run off of 110 or 230 VAC. When run on 110 volt, the PSU is rated to provide up to 1500 watts. Even better, EVGA claims an efficiency rating of 80 PLUS Gold. Interestingly, the PSU is “overclockable,” in the sense that it can deliver up to 1650 watts when hooked up to a 230 volt circuit. The overclocking is done in a piece of SuperNOVA software. The software allows the following monitoring and adjustment functions:

Monitor voltage

Monitor current draw for each rail

Monitor power used

Monitor efficiency

Change fan profile

Adjust the +12V rail (and configure single or multi rail mode)

Other features of the EVGA power supply includes Japanese capacitors throughout and a fully modular design–even the 24-pin ATX cable is modular which is nice to see.

The cables are all sleeved in the black and red EVGA color scheme. It comes with the following cables:

1 x 24-pin ATX

2 x 8-pin EPS12V (the CPU power socket on the motherboard)

16 x 6+2-pin PCI-E

3 x 6-pin PCI-E

12 x SATA

8 x Molex

2 x Floppy

1 x USB (that’s one I’ve not seen before on a PSU!)

The EVGA NEX1500 is packed with lots of features that enthusiasts like to see, but it will cost you. It has an MSRP of $449.99 USD and will be available later this month (August 2012). Fortunately, EVGA seems confident that this will be the only PSU you will need for a while as it comes with a 10 year warranty. You can find more information and photos on the EVGA product page.

The EVGA SuperNOVA software for monitoring the PSU

It is interesting that the company’s debut product is one on the very high end of the market. It could be a good thing, however. If reviewers find it to be a quality product, it will be the ideal platform for the company to work from to create lower cost (and lower wattage) models for the rest of the computer market.

At $120 on NewEgg, the Antec Earthwatts Platinum is not a bad choice for those looking for power and efficiency. Although it is SLI rated, with only two 6+2 PCIe power connectors you will need to rely on molex adapters to run two cards and at 650W they will not be current flagship models. Legit Reviews saw some questionable results while testing but for a PSU of this price, especially such a quiet and efficient one, it comes with a recommendation to stop worrying and pick it up.

"When it comes to performance, besides its high electrical efficiency which is expect from an 80Plus Platinum unit. The Earthwatts Platinum 650W PSU also excels in acoustics, with the unit running entirely silent across the entire nominal load range. The high efficiency also allows it to operate at fairly low temperatures as little energy is wasted as heat. Even though most hardcore enthusiasts would find this unit's electrical performance mediocre, we believe that the ripple suppression and voltage regulation of the Earthwatts Platinum 650W unit is more than acceptable for a sub-$100 product..."